A bookie was walking the grand national course. At the water jump he sees a little girl with a rod and a float in the water. "You'll never catch anything in there" he says.
Girl asks, "what odd will you give me?"
Bookie, "20 to 1"
Girl, "okay,here is £1"
Bookie takes the money and as he is walking away the Girl shouts him back.
He turns to see a flat fish on the hook. "Fair enough, here you go." And he hands over £6.
Girl, "But I should get £20 plus my original £1"
Bookie, "Sorry, it's quarter odd for a plaice"
I'll get my coat.